Sofa



FIG. 1 is a perspective view of a sofa showing our new design;

FIG. 2 is a front elevational view;

FIG. 3 is a top plan view;

FIG. 4 is right side elevational view, and the left side elevational view being a mirror image thereof;

FIG. 5 is a rear elevational view; and,

FIG. 6 is an enlarged fragmentary view of stitches of a sofa taken from the broken-line region of FIG. 2. 

The ornamental design for a sofa, as shown and described. 